The Massachusetts cop suspended after leaking arrest photos of Dzhokhar Tsarnaev — following the publication of a sympathetic photo of the Boston Marathon bombing suspect on the cover of Rolling Stone — is back at work.

Sgt. Sean Murphy, a 25-year veteran of the state police, is now working the 11 p.m. to 7 a.m graveyard shift at Athol. Murphy had been at the department's Framingham headquarters.

Murphy took the crime-scene pictures as Tsarnaev, 20, was arrested.

State police spokesman David Procopio says Murphy's assignment, which began last week, is not punishment for the unauthorized release of dozens of photos, including some showing the bloodied former college student with the red laser dot of a police sniper's scope on his forehead.